lol
I just found out what it is a quote of.
OK, you could quote a Tupac song in your application essay if you really wanted to, as long as you referenced what you were quoting. And if you are quoting something, you quote it exactly, you don't tidy up irregular English.
But are you really sure that quoting a Tupac song is the best idea for your college entrance letter? How is that specific line about unconditional love in the slightest way relevant? If you want to quote that song I would have thought "Though things change, the future's still inside of me" would have been more appropriate.